/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.trino.spi;

import java.util.List;

public interface Mergeable<T>
{
    /**
     * Merges the current state with the state of the other instance, and returns the merged state.
     *
     * @throws NullPointerException if other is null
     */
    T mergeWith(T other);

    @SuppressWarnings("unchecked")
    default T mergeWith(List<T> others)
    {
        if (others.isEmpty()) {
            return (T) this;
        }

        Mergeable<T> result = this;
        for (T other : others) {
            result = (Mergeable<T>) result.mergeWith(other);
        }
        return (T) result;
    }
}
